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| SITE LISTINGS |
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| Alphabetical | By Popularity | | - Illinois Geological Survey
 - Nevada Bureau of Mines and Geology
- State geological survey, operated as a research and public service unit of the University of Nevada. - Iowa Geological Survey Bureau
- Collects and manages information on the geology and water resources of Iowa. - Alabama Geological Survey
 - Colorado Geological Survey (CGS)
 - Maryland Geological Survey
- Concentrates on the physical structure of the State of Maryland, particularly on coastal and estuarine research. - South Dakota Geological Survey
 - West Virginia Geological and Economic Survey
- Provides information about the West Virginia's energy resources including coal, gas, and oil. Also find topographic, geologic, resource, and reference maps, information about geologic hazards, earth science education resources, and more. - Arizona Geological Survey@
- Alaska Division of Geological and Geophysical Surveys
- Determining the potential of Alaskan land for geologic resources and hazards. - Kansas Geological Survey
 - Idaho Geological Survey
- Serving the state of Idaho through geologic research, earth science education, data collection, and publication. - Utah Geological Survey
- Investigates geologic hazards, mineral, energy, water, and palaeontological resources, and provides geologic and topographic information. - Minnesota Geological Survey
 - New Jersey Geological Survey
 - Pennsylvania Topographic and Geologic Survey
- Explores, collects, preserves, and disseminates impartial information on the state's geology, geologic resources, and topography. - Oklahoma Geological Survey
- State agency for research and public service. - California Geographical Survey
- Includes electronic map library, and other geographic resources. Part of the department of Geography of California State University.
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